Capabilities of the R2D detector Matt Lamont, Yale University : RHIC II Workshop2 Relevant RHIC-I results v2 and jet quenching might probe d.o.f above Tc ! Jet Quenching: The quenching of high p T particles due to radiative partonic energy loss. Energy loss 15 times higher (several GeV/fm3 ) than in cold nuclear matter (compare RHIC AA to HERMES eA) Hydrodynamics: Strong collectivity in a liquid like (not plasma) phase which requires a partonic EoS Constituent quark scaling: recombination provides a description ~ GeV/c for identified particle properties : RHIC II Workshop3 Contributions to particle production in RHI collisions pTpT pQCD Hydro ~ 2 GeV/c~ 6 GeV/c Soft Medium modified fragmentation (jet quenching) 0 Parton recombination and coalescence Fragmentation ~ 30 GeV/c ? LHC, RHIC-II SPS, RHIC-I RHIC-II: p T to 30 GeV/c Max. jet energy: 60 GeV : RHIC II Workshop4 < 0.5 p q,g > 10 GeV/c Multiply pp events by factor of ~ 8 x for AuAu events in 30 nb -1 RHIC-II year p q,g > 10 GeV/c all 10 6 particles in AA 5 Gev higher in momentum factor 10x smaller yield 100K with p T >20GeV Are p+p particle spectra at RHIC-II p T limited ? : RHIC II Workshop5 R2D Concepts What is missing in current RHIC detectors ? Large, continuous coverage in , and p T Onium, -jet, R AA ( p T, ), v 2 ( p T ) PID out to high p T Identified v 2, identified jets, identified 2-particle correlations Hadronic calorimetry Isolation cuts, missing energy, unbiased jet triggering : RHIC II Workshop6 Requirements for an Ideal Detector High rate detectors, DAQ Required for high luminosity A+A, p+A and p+p collisions at RHIC II Uniform high magnetic field over large volume Good quality tracking/momentum measurements Precision Vertex tracking 4 EM and Hadronic Calorimeters Missing energy measurements and identification e/h discrimination At low p T as well as at high p T /K/p identification Momentum up to ~ 25 GeV/c Forward capabilities High-rapidity measurement/identification possibility : RHIC II Workshop7 EOI for a comprehensive New Detector for RHIC II P. Steinberg, T. Ullrich (Brookhaven National Laboratory) M. Calderon (Indiana University) J. Rak (Iowa State University) C. Markert, S. Margetis (Kent State University) M.A. Lisa, D. Magestro (Ohio State University) R. Lacey (State University of New York, Stony Brook) G. Paic (UNAM Mexico) T. Nayak (VECC Calcutta) R. Bellwied, C. Pruneau, A. Rose, S. Voloshin (Wayne State University) and H. Caines, A. Chikanian, E. Finch, J.W. Harris, M.A.C. Lamont, J. Sandweiss, N. Smirnov (Yale University) Submitted : Aug 04, ArXiv : nucl-ex/ : RHIC II Workshop8 L-R2D - SLD Magnet 2.8m 6m : RHIC II Workshop9 S-R2D - CDF Magnet CDF, CLEO and BABAR have same size magnets SC Coil; R = 1.5 m; Bz = 1.5 T EMC, CsI crystal, ~24 X 0 Si Vertex D. Rcoil = 150 cm AeroGel2 Ch. D. AeroGel1 Ch. D. GEM Tracking D. Si Strip Detectors HC and Muon Detectors Gas RICH Detectors : RHIC II Workshop10 Differences between L-R2D and S-R2D Magnetic field strength 1.3T 1.5T - not much difference (~2.5x STAR) PID capabilities Dependent on RICH detectors, not layout Size/Cost SLD layout is larger and more costly in terms of infrastructure (need changes to 12 oclock, CDF layout fits inside a current hall). No difference in physics observables for either layout. : RHIC II Workshop11 Need high p T PID and large acceptance ! 10 GeV 4 GeV PHENIX STAR, 4 GeV 0 22 R2D, 25 GeV : RHIC II Workshop12 Large acceptance for all detector components High momentum PID RICH + Aerogel Calorimeters EMCAL + HCAL Central Tracker Vertex Tracker All components cover | | < 3.5 PLUS dedicated forward tracker to | | < 4.8 : RHIC II Workshop13 Acceptance in and p T distributions in pp ( +jet) Broadening in and pp AA pp AA Preliminary STAR results on number correlations for p T < 2 GeV/c parton fragmentation modified in dense color medium: elongation even on near side Essential for jets, high p T correlations, quarkonium, spin programs can measure 40 GeV jets: 180k in 30 nb -1 Octupole Twist nucl-th/ : RHIC II Workshop14 L-R2D Detector Coverage p (GeV/c) A1+ToF A1+A2+RICH RICH dE/dx, ToF PID ( , K, p) Calorimeter and -detector: = +/- 3.4 Tracking: = (-3.5 +4.5) PID: = +/- 1.2 (2.8) RICH : C 5 F 12 - n = PID : RHIC II Workshop15 Momentum reconstruction p T, GeV/c || = ( ) || = 2. 2.5 || = 2.5 3. = 3. 4. dp T /p T, % p T, GeV/c Pad Detectors only All tracking { || = ( ) } * dp T /p T, % : RHIC II Workshop16 J/ , e+e- (+-), | | 2 GeV/c for J/ , 4 GeV/c for ) E 2 GeV E 4 GeV ?? : RHIC II Workshop18 High p T Identified particles & jets in R2D : RHIC II Workshop19 Summary : Comparative Physics Reach PHENIX-II STAR-II ALICE R2D De-confinement and low x physics a.) Onium physics J/ c Y(1s) Y(2s) Y(3s) b.) Rapidity gap measurements and forward physics > 1 > 2 > 3 > 4 > 5 > 6 c.) Degrees of freedom above Tc (w. PID) v2 > 4 GeV/c::R(AA) | |=1::v2 > 10 GeV/c::R(AA) | |=3 Fragmentation and hadronization a.) Di-hadron jets 10 GeV 20 GeV 30 GeV 40 GeV b.) Gamma-jet with identified hadrons (h > 5 GeV/c) 5 GeV 10 GeV 15 GeV 20 GeV c.) Identified high p T di-hadron correlations pp > 3 GeV/c > 5 GeV/c > 10 GeV/c > 5 GeV/c : RHIC II Workshop20 Backup Slides : RHIC II Workshop21 Muons: - MIP track reconstructed in HC, catcher & Muon Detector; - matching with track inside of Magnet e/h: - high Pt; EMC (E/p), HC, all Ch. Detectors - low Pt; dE/dX, ToF, Ch. Detectors /K/p: - dE/dX, ToF, AeroGel and Gas Ch., & gas RICH Detectors How PID is done in R2D : RHIC II Workshop22 dp T /p T and PID possible performances ( barrel part) GeV K p p K AG1 +AG2 + GCh1 +GCh2 AG AeroGel Ch. D. GCh Gas Ch. D. Plus: dE/dX, EMC, HC, Muon D. AG1 +AG2 +GCh : RHIC II Workshop23 : RHIC II Workshop24 : RHIC II Workshop25 : RHIC II Workshop26